Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Recursive functions will overflow the stack, this is a 
known and unsupported functionality. 

Interestingly enough this code works fine with PHP running in FreeBSD.  Why is that?  Any ideas?

I'd guess it has to do with FreeBSD == 'Good'.

Fortunately, there is a solution.  One just needs to create your own array_walk function (yes, PHP allows you to write functions!):


    function array_walk_r(&$array, $function, $data = null)
    {
        foreach ($array as $key => $value)
        {
            call_user_func_array($function,
                                 array($value, $key, $data));
            $array[$key] = $value;
        }
    } // end func array_walk_r

It's too bad the PHP folks can't support us more functional-minded folks.